For your first and second question, Datapane provides a hosted, and fully managed service for companies, similar to the offerings of most SaaS companies. For companies that want full control of their data, Datapane provides an on-premise solution that can be installed into their own data center / private cloud.
For the third one, I would assume you are talking about the component Table in the Report. It is totally fine for you to send an excel to your teammates or for the manager. But when your analysis results are given by multiple charts, data, as well as text, sending them in different formats (Excel, images, text messages) will be a headache for your receivers.
It is not that you need to give up your favorite tool but to use a new tool to increase your work efficiency in appropriate contexts.